Cracked plastic top frame on 180 gallon tank

[CarpCharacin]

My 180 gallon tank has been sitting outside on it's side for a few months because I need to build a stand, but I noticed that the top plastic frame on the tank is cracked. Does anyone know where I can get a replacement frame? I feel kind of dumb for leaving the tank sitting on it's side, I think that's what probably caused it to crack, but there isn't a while lot I can do about it now other than replace the frame.

 

[CarpCharacin]

I'm probably going to end up making new center braces out of glass, because I can't find a replacement plastic top frame.